Electric-lamp socket.



Mn. 716,578. Patentd Dec. 23; 1902.

c. n. PLA TT.Y ELECTRIC LAMP SOCKET (Application filed Aug. 20, 1901.)

[We Model.)

h I INVENTOH C mmw @flflwz KT am A rromv 33 WITNESSES Unites States .(FLARENCE D. PLATT,

area- T rni'cn F BRIDGEPORT, CONNECTICUT, ASSTGNOR TO THE PORATION' O F CONNECTICUT,

ELECTRIC-LAMP sooner.

SEECZFIGATION fanning part of Letters Patent No. 716,578, dated December 23, 1902.

Application filed August 20, 1901. Serial No. 72,694.

(No model.)

To all Iii/"tom, 56 may concern:

Be it known that I, CLARENCE D. PLATT, a citizen of-the Uni ted States of America, residing in Bridgeporhin the county of Fairticld,

State of Connecticut, have invented Im provements in Electric-Lamp Sockets, of which the following is a specification.

My invention relates more particularly to that class of electric-lamp sockets which are to commonly lrnown as pull-sockets,because the circuit=brcakcr or switch in the socket for throwing the lamp into and out of circuit is operated loythe pull of a'cord or chain instead of by means of a rotating key-piece.

x5 The main object of my invention is to constructan eflicientand economically-manufactored switch mechanism for a socket of this character.

In the accompanying drawings, Figure 11's a. sectional plan View on the line 1 1, Fig. 2.

1g. 2 is a view, partly in section, taken on the line 2 2, Fig. 1; and Figs. 3, 4, 5, and

6 are perspective views of details of the switch. p

The socket may, as usual, comprisea metal cap A and ShBBiZllJGlfLi shell 15 and two insulatingdiaphragms C and D, whichare spaced apart and secured together brackets E and F. The switch mechanism,

hereinafter described, is carried by and between these two insulating-chaphragms, and

' the whole may be maintained inplace in the outer metal casing by means of the same screws which secure the cap A to the shell 13 in any usual and well-known manner, as by the inner ends of the screws taking into recesses in the upper insulating-diaphragm O. The contacts for the terminals of the incandesoent lamp are carried bythe lower dia- 40 phragln D. In the present instance I have shown these contacts adapted for What is known as the I l-i lamp and comprising a central screw-stud S and an annular ring R, as usual.

4.5 "A central spindle G,on which the main moving parts of the switch are to turn, is mounted inareccss'in the upperinsulatingvdiaphragm C and at its lower end in an insulating-bushing 9, set into the upper end of the central 5o contact-stud S, Fig. 2. This stud Sis seby two metal terminal.

cured centrally in the lower insnlaiiug-diaphrag'm D by means of a screw-nut H, fitting in a rcoessin thcupperi'ace of thediaphragm D, Fig. 2.

A ratchetcominutator .l (more fully illustrated in Figs. 3 and l is mounted to turn freely upon the spindle G. l: have shown this ratchet as provided with four teeth, theouter faces of two oi. which are of conducting;- ma

terial, while the others are non-conducting. 6o

In the present instance the body of the com mutator is made of suitable insulating mate rial, and a plate K, of conducting material,

is passed around the underside of the ratchet,

as shown in the inverted perspective View, Fig.4, the outer ends of the plate being boot up, as at 7r, over the outer curved faces of two opposite ratchetteeth. When this com mutator is in place, as shown in Fig. 2, this plate K is in electrical contact with the nut: II, and therefore with the terminal stud S.

A spring contact-pawl M, Fig. 0, has its free end to bearagainst the outer faces of the teeth of the ratchet-commutator, Figs. 1 and 2, the other end of the pawl being secured to the bracket E,to which one of the load lug-in wires may be connected,as usual. In the 1)IJS6llhll1 stance I have shown this spring contact-pawl M as provided with a foot-piece m to go under the foot of the bracket E, so as to be 8c clamped between the foot of the bracket and the diaphragm D by the cures the bracket, as illustrated in Fig. 2.

It will thus be seen that when the ratchetcommutator is turned so as to bring the free end of the contact-pawl M to bear against one of the ends ofthe plate K of the com1nutator J ,thecircuit will. thereby be closed from the bracket E (to which one of; the leading-in wires is connected) to thestud S and its lan1p- A quarter-turn of the ratchet-coin mutator will then sever this connection,:l1owever, leaving the pawl 011 one of the non-conducting teeth of the ratchet.

To givethe ratchet-commutator the neces sary quarter-turnsto make and break the circuit, as described, I prefer to use the form of clutch devices illustrated more fully in Figs. 3 and 5 and which I will now describe.

On the upper face of the insulating-body of the commutator I grooved flange F J is fixed a clutch-disk N, which has stamped up from it a suitable number of inclined teeth n, Fig. 3. The operatingpart of the clutch is shown more fully in Fig, 5 and consists ,ot a sheet-metal plate P, having a disk part 10, which has stamped up on it a number of teeth 1) to mesh with the teeth a on the clutch-plate N or the commutator J. The rest of the plate P is of see;- mental form, as illustrated in Figs. 1 and v5, and at its curved periphery is formed a for the reception of the chain Q, the end of which is secured X, Figs. 1 and 5. The body cord or to the flange at of the cord or chain passes thence along this grooved flange and out through an open tunnel b, Fig. 1, formed in the shell B, as is common. By pulling on this chain Q, the clutchplate P can be turned on the spindle G from the position shown in Fig. 1 in the direction of the arrow until the segmental plate strikes the stop -v' on the diaphragm D. This quarter-turn carries with it the ratchet-commutator, owing to the engagement of the clutchplates with each other,- hen the cord is released, the operating clutch plate I is returned to its initial position against the backstop n, Fig. l, by means of a helical spring T, Figs. 1 and 2, which is boiled around the spindie and has its upper end secured in the diaphragm C, while its lower end bears against a finger tfFig. 5, on the clutch-plate 1. This spring T, while thus acting as a return-spring for the clutch-plate P, also by its endipressure tends to force the clutch-faces into engagement with each other. The contact ill acts as a stop-pawl to prevent return movement of the ratchet-commutator with the return movement of the clutch-plate l. 1

1 claim as my invention- 1 1. In a pull-socket for electric lamps, the combination of two insulating-diaphragms, i supporting-brackets therefor, and lninp-torminals carried by one of the diaphr-agms,with a rotary ratchet-commutator having; condncti ing part name ing and non-conductingteeth on its periphery, the conducting-teeth having electrical connection with the central lamp-terminal, a contact-pawl to bear against said teeth an means for rotating the commutator.

2. In a pull-socket for electric lating parts, a spindle supported thereby and a rotary ratchet-commutator composed of an insulating body and a plate with its ends flanged over the alternate teeth of the ratchet, a lamp-terminal stud making contact with said plate, in combination-with a contactpawl in the circuit and means ior'turning the ratchet-commutator.

3. In a pull-socket for an electric lamp, the combination of two insulating-diaphragms, supporting-brackets therefor and lamp-terminals on one of'the diaphragms with a spin-' die supported by, but insulated from, the central lamp-terminal stud, a rotary ratchet-commutator, means for turning the same and a contact-pawl for the commutator, substantially as described.

4. In a pull-socket for electric larnps, the combinatimi of the movable part of a pawland-ratchct circuit-breaker with an operatconsisting of a segmental plate with a grooved flange on its curved margin for the reception of the pull-cord.

5. In a pull-socket for electric lamps, the combination bf insulating parts and a spindle supported thereby with a rotary ratchet-commutator having conduct in and non-conducting teeth on its periphery and a clutch-disk on one face, a segmental toothed plate to gear with the said disk, and a contactqlawl in. the circuit. to bear against the peripheral teeth.

In testimony whereof I have signed my to this spccilicaton in the presence of two subsciibin witnesses.

l). lLA'lT.

Witnesses:

L". A. bronns,

lamps, insu-z 

